I actually finally found out from the AN people themselves, but thanks so much for the offer. ^_^ It was Hallelujah, using Trigun footage. Apparently it won Momiji no Video. I'm a little bit euphoric right now.

If so, it's a damn fine song.... and if so did you use the original or one of the numeours interesting covers?

Yep, that's the song--but I used Rufus Wainwright's cover of it. It was the first version I'd heard, and in retrospect it works better for a video anyways. Love it.

Thanks so much for the lovely comments, everyone. I'm still occasionally doing dances of glee. (If by "occasionally" I mean "constantly.") Congrats to all the winners--I just wish I could have been there to see them!